Roof construction for reverberatory furnaces



1 41 6X16, Patented M1323 19:22,

A. N. JETTE.

ROOF CONSTRUCTION FOR REVERBEHATORY FURNACES.

APPLICATION FILED AUG,3I. 1920.

Caz/ruse A se: B

furnace 10 has a'relatively large number man STATES PATENT- OFFICE.

ARCHIE NOEL JETTE, 0F ANACONDA, MONTANA.

Application filed August 31, 1920. Serial No. 40 4i41.

To all whom it may concern: 7

Be it known that I, ARCHIE Nona JETTE, a citizen of the-United States,residing at Anaconda, in the county of Deer Lodge and State of Montana,have invented certain new and useful Improvements in Roof Constructionsfor Iieverberatory Furnaces, of which the following is a specification.

This invention relates to metallurgical furnaces of the reverberatorytype and more particularly to roof construction thereof.

In reverberatory furnaces constructed with the simple arched roof, theroof' is only as strong as its weakest point. When a portion of the roofbecomes thin or burned out, a settling is the inevitable result andoperations must be stopped and the roof must be rebuilt. This means acomplete shut down for a considerable length of time.

Many attempts have been made during the last twenty years to evolve roofconstructions of longer life and ribs have been provided, in particular,for that purpose but these attempts have met with little success. Theobject of the present invention is a roof construction embodying ribswhich afford a reliable support for the arched roof, prevent caving inwhen a portion is burned through and admit of local repairs.

;F or a full understanding of the invention,

ings in which.

Fig. 1 is a perspective view of a roof construction embodying theinvention.

Fig. 2 is a longitudinal section through a furnace, embodying the.invention; and

Fig. 3 is-another perspective view representing a transverse sectionthrough the structure shown in Fig. 1. As indicated in Fig. 2, the roof.of the reference is bad to the accompanying drawof transverse. ribs ll.These ribs are of such height and width that considering them asstructurally independent of the body of the roof, they are capable notonly to form stable structures but also to act as suspension elementsfor carrying weight. 'In fact these ribs are primarily designed to carrythe weight of the roof after the latter has deteriorated, due to thevarious influences at work, to such an extent that it would, at least inpart, cease to be self-supporting.

This being the broader aspect of the invention, the more specificfeature relates to the problem of so interconnecting the ribs and thebody of the roof that they form one Specification of'Letters Patent.

Patented May as, was.

unitary homogeneous structure such that should at least portions of theroof become very thin or burned out, the cohesion between the materialat or around the damaged regions and the adjacent ribs is sufiicient toprevent caving in or collapse.

The refractory material from which the roof is built is in the form ofbricks as usual.

While there is, of course, some latitude in the arrangement of thebricks to form a solid cohesive structure, I have found that thearrangement represented in Figs. 1 and 3 is very satisfactory and forthis reason I consider it at present as the preferred embodiment of theinvention.

The roof structure may be built up from have the following dimensions:

Brick I :3 x 6 x 20. Brick II :3 x 9 X 20. Brick III=3 x 9 X 15.

The brick II is the principal form used and the forms I and III are usedin regular turns to bring about that overlapping and intergrippingrelation which is necessary to produce a solid mechanically homogeneousstructure. I

As seen in Figs. 1 and 3, course A is composed of bricks of form- IIintermediate the ribs. Within the width of the ribs course A includes atthe bottom,-brick 'III and above it bricks I and II.

Course B is composed of bricks II alternating adjacent the ribs withbrick I and the space allotted for the rib is completely taken up bybrick III. Course B also starts with brick I.

By this arrangement the bricks forming the body of the roof are made tooverlap, the bricks forming the ribs are made to overlap and the bodyand the ribs are in intimate intergripping engagement. After theapplication of the usual binder the combined roof and rib constructionis for all practical urposesa single integral structure in w ich eachcomponent part i. e. each brick or fraction thereof is firmly held tothe adjacent part and the sections intermediate the ribs are securelybound to the ribs. Thus, if one layer after another should be removedupgrated or eaten away under the effects of the high temperatures in'the furnace without incurring a collapse'or-partial collapse of thereofstructure.

In fact damaged portions of the roof may be required from time to timesince the ribs form a skeleton structure on which the arts inserted aretemporarily supported until the mutual supporting action of the newlyassembled parts assisted; by the binder has become sufficient to makeitself-supporting.

The life of the roof may thus be extended indefinitely.

As shown in Fig. 3, in every alternate course B the bricks I and IIforming the body of the roof are tapering, the courses thus modifiedbeing indicated by the letter X. This arrangement is made, as isobvious, to produce a solid arch structure of fire brick. The taperedbricks are 2%" thick at the bottom and have the normal.- thickness of 3"at the top. In this way the bodyof the roof exposed directly to the hightemperatures consists substantially of a solid mass of fire brick.

I claim:

1. An arched roof for a metallurgical furnace having ribs projectingfrom its upper surface, in which the bricks of alternate courses aresimilarly disposed and in which the joints of all bricks in one courseare overlapped by bricks in the adjacent courses.

2. An arched roof for a metallurgical furnace having ribs projectingfrom its upper surface in which different'sized bricks are so disposedthat the joints of all bricks in which the joints of all bricks in onecourse are overlapped by bricks in the adjacent courses.

5. An arched roof for a metallurgical furnace having ribs projectingfrom its upper surface, in which bricks of three different sizes aresimilarly disposed in alternate courses in such a way that the joints ofall bricks in one course are overlapped by bricks in the adjacentcourses.

6. An arched roof for a metallurgical furnace having ribs projectingfrom its upper surface, inwhich the; bricks of alternate courses aresimilarly disposed and in which the joints ofall bricks in one courseare overlapped by bricks in the adjacent courses,

the arrangement beingsuch that in alternate courses bricks extend fromwithin the body of the roof upwardly above the surfacethereof and thatin the remaining courses the spaces between "the upwardly projecting"kinds of bricks having a length equal to the thickness of the bodyof theroof and a combined width equal to the width of the ribs and the thirdkind of bricks having a length equal to the width of'the ribs and awidth equal to the height of the ribs, the arrangement being such thatthe ribs are formed of two bricks extending from within the-body of theroof in alternate courses upwardly above the face thereof, and bricks ofthe third kind filling the spaces between the projecting parts of saidbricks, the spaces below the upwardly extendingbricks-being taken. up bybricks of the third kind.

a 8. An arched roof for a'metallurgical' furnace having ribs projectingfrom its upper surface and composed of three different kinds of brickssimilarly disposed in alternate courses sothat the joints of all bricksin one course are overlapped by bricks in the adjacent courses, two ofthe different kinds of bricks having a length equal to the thick ness ofthe body of the roof and a combined width equal'to the width of the ribsand the third kind of bricks having a length equal to the width of theribs and a width equal to the height of the ribs, the arrangement beingsuch that in one set of alternate courses two bricks extend from withinthe body of the roof upwardly above the surface thereof, the spacesbelow the said upwardly extending bricks being filled by bricks of thethird kind, and that in the second set of alternatecourses the spacesbetween the projecting parts of said upwardly extending bricks arefilled. by bricks ofs'the third kind and the arrangement being furthersuch that in some of the second set of courses the bricks forming thebody of the roof are tapered towards the bottom. a

r In testimony whereof, I aifix my signature.

ARCHIE NOEL J ETTE.

